- TCP control flags (SYN, SYN/ACK, FIN, FIN/ACK, RST)
- One icmp/udp request and one response
- FGT wants to generate ICMP message
- An incoming packet should be fragmented (egress packet can be fragmented by NP)
- Interface flaps
- Policy changes
- Route changes
- UTM proxy features
- sflow
-Session helper control channel
- Manually disabled by policy
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